Just saw it yesterday, excellent movie. Ironically, I had also just finished reading "The Fall of Berlin", but apparently a different version, by Anthony Read and David Fisher.
Anyway, it was great to see the scenes and personalities brought to life, and with decent production qualities. They weren't long battle scenes, but still intense; and it was chilling to see the 12 year old boys and girls ready to die at the flak batteries.
Ganz was fabulous, and I thought the Goebbels were both excellent as well. Weidling and Mohnke were well done, too. Overall there was a great feel of the impending doom and immenent... downfall... that awaited Berlin.